Improvement in tightening pulleys by friction



' PA'TENTED AUG. 8, 1865! F. SKINNER.

TIGHTENING PULLEYS BY FRICTION.

'- UNITED STATES PATENT OFFICE.

' FRANKLIN sKIuNEa, OF NEW HAVEN, CONNECTICUT.

IMPROVEMENT m. TIGH I'E NlNGPULI E'YS BY FRICTION.

Specification forming part of Letters Patent No. 49,812, dated August 8, 11-565.

f To all wlidm it may concern Be it known that I, FRANKLIN Summits, of the cityand county of New Haven, in-the State of Connecticut, have invented a new and useful Improvement in Tightening Pulleys by Friction and I dohereby declare that the following cutting, 850., showing the adjustable collar,

conical clutch-slide, and the friction brakes. Fig. 2 is a section of the same cutlongitudi nally through the center, showing therelative positions of the several parts botluwh'en worked as tight pulleys or as loose. Fig. 3 is a perspective view of the adjus'table collar E,'Fig. 1, showing the outer ends of the brakes and the curved inclined plane on which the conical slide, Fig. 5, operates to tighten the pulley. Fig.4is a perspective view of one of the brakes with its arm or rod by which it is to be operated. Fig. 5is a perspective view of the conical slide which the clutch-lever-moves to tighten the brake. i

My improvement consists in securing on' ashaft or arbor one or two adjustable collars,

each having two or more hollow arms at right angles to its axis, and in each of the arms or sleeves I insert a movable rod or plug, with its inner end curved and beveled to suit the convex surface of a conical slide or wedge, and on the outer end I- have a friction-brake with a convex surface suited to impinge against the internal surface of the web of the pulley, and

in using on the cylindrical shaft or arbor a hollow conical slide. or wedge of such tapering shape that when the clutch-lever forces it into the adjustable collar the enlarged part will force the frictiombrake outward,so as to brake or impinge upon theinternal surface of the web of the pulley and bind it so tight that the shaft must revolve with the pulley, while at other times the pulley willrevolve loose.

I make the arbor or shaft A A, Figs. land 2, of steel or any other suitable material, of a true cylindrical form from endto end, so that- 'thc' collars B B of the pulleys O 0, the conical slide or wedge D 1), the adjustable collars E and E, and the bh ding-collars F and F may all pass freely on it.

' I make the adjustable coilars E and of -.ironor anyot'her suitable material, who two or more hollow arms or sleeves, b and 1;, substantially as shown in'Figs. 1 and 3 and indicated insection in Fig. 2. .I make these arms or sleeves b b hollow, as indicated in section in Fig. 2,an'd insert into each-a rod or plng'niade substantially-of the shape or form shown in 3 Fig.4, with the inner end curved and inclined, as shown at 0, Figs. 3 and 4, and indicated in section at c and c", Fig. 2, and with a convexsurfaced brake at the outer end, as shownat (1, Figs. 1, 3, and 4,-' andindicated in section at d and (1 in Fig. 2, and suited to drop into the 'hollowarnis on sleeves b and'zb, as shown in Figs. 1, 2, and 3, with a small projection or spline, as 0, Fig.4, to work in a groove to keep it from turning, and I'attach spiral springs,as at h h, Figs.'1,2, and 3, to hold them toward the center, when they are not forcdoutward by the cqnical slide orwedge DD for tight-j euing the pulley.

' I make the hollowconical slide or wedge DQ D -ot' iron or any other suitable material, substantially in the form and of the proportions shown in Fig.5and indicated in section in Fig.

2, when I use the pulleys double, as for cutting screws, &c., though either end I) or D will be snflicient in the common lathe, and on this conical slide 1) D, I. .have a projection like g,

Figs. 1, 2, and 5, on-which the clutch-lever opcrates to throw the desired pnlleyingear.

, I make the pulleys O and C of cast-iron or any other suitable material, with a suitable;

collar, as shown at B, Fig. 1, and asindicated in section at B and B in Fig. 2, titted to turn freely on the arbor orshai't A A, and I make the other end large and open, as shown at Gand; C, Fig. 1, and indicated in section'iu-Fig. 2, so that the adjustable collar E or E, with its appendages, may work within the space thus left open.

appendages, as shown in Fig. 3, onto the arbor or shaft-AA, and secure or adjustit in the desired place by the binding-screw a, Fig. 1, as at E or E, Fig. 2, and E, Fig. 1, when the Having made the severalparts as beforede- 1 scribed, I'place the adjustable collar, with its l springs h and h' will force thei rods 'or plugs,

' Fig.4, inward to the position'shown at c,-Fig.

5, and at c c, Fig. 2, so that the ends 0. and 0- may extend beyond the inner surface of the collar. 1 then slip on the conical slide or wedge, Fig.5, ns'shown at D- D, Fig.-1,'so =that one of the diminished ends will-ipnss int'oithe eularged portion-oi the collar E, as indicated in section in Fig. 2; and when two pulleys fine-to be used I then'put on'the other adjustable eellar, E, as indicated in section in Fig. 2, and

secure or adjust it in its proper position by a binding-screw, like a, Fig. '1; and when the adjustable collars E and E are properly secured, with the conicalslide I) D in. its place, I slip on .-the pulleys O and (Y and secure themin'their places'by the two collars Fraud Ff, which I confine by ordinnry hinding sc'rews, asshown in Fig. 2, when the whole will appear as in Fig. 1, end will be ready for use as the double pulley torscrew-cntting, 8pc.

. WheIfI wish to tighten one of the pulleys,

. ,the internal surface of, the pulley O", asfisli'ova'n at d and (1', when the shaft will b excarried -roundwith the pnl'l'ey 'io prodnce' the operation .desired, while the. otherpnll'ey, G, will run en'- ti rely'loosc,jbeeause the end'D off-the conicaliglide'wili be drawn hack so as not to press againsttheinner ends, and 0,.of the rods or plugs, Fig. 4, but will allow the springs h and h to force those lugsinward, so that the brakes will not touch t e internal surface. of the pulv ley 0, as shown at d and d, all as represented in section. in Fig. .2. This slide D D maybe reversed in its position as often ns desired'or I as the worl; being done may require-,and when desired it maybezplaeed midway, when both of the pulleys will 'rur'i"loose. When but one pulley is nee lar with itsappurtenances is necessary, and.

thepulleycan be runes fast or loose at pleasure. The advantages of my improvement consist in thesimplicity ofitseonstructiomin its freedom from liability -to get; out of repair, in the ease and readinesswith which the 'pul'leys are thrown inand out of gear, andin that it so ef;

factually ob'viates' the unpleasant-noiseot' the common clutch and prevents the great strain which is inseparable from the unyielding char: vactor of the common clutch; What I-cl'aim us my inventiom'nnd desire to secure; by Letters-Patent; i's- {The combinati'onpl' the'adjustahl e collar and its appendages, Fig, .3, with the conical slide;

Fi'g. 5, andpulleys Q 0, when: they are constructed' substantial 1y as'hereindescribed, and

are fitted for use (either doubleor single') on a proper arhorlor'shaft as herein sctjforth. f FRANKLIN SKINNER.

witn essesri I JAs.-"-P.-Bn'is17oL,.

FITZGERALD."

ded, as in alatne for ordinary purposes, 'but .oneadjnstable c'o1-' 

